Calipers



J. W. LOVELL.

cALlPERs.

APPLICATION FILED NOV. 25l i919- 1,358,321 Patented N0v.`9, 1920. y

In Nq heb Q I@ I w E; QN

III/IIA IIA INVENTUR' ATTORNEY UNITED STATES JOSEPH WENCELASS LOVELL,y OF ST. lC.k'i-IARINES, ONTARIO, CANADA.

cnmrrins.

Specification of Letters latent. `Patented NOV. 9,1926.

Application filed November 25, 1919. -Seral No. 340,641.

To all io hom it 'may concern:

Be it known thaty I, JosnrH W. LovnLL, a citizen of the Dominion of Canada, residing at St. Catharines, in the county of Lincoln and Province of Ontario, have invented certain new and useful Improvements in Calipers, of which the following is a specification.

This invention relates to improvements in calipers, which are adapted to receive and cooperate with a micrometer head whereby small fractions of an inch may be measured.

The object of my invention is to provide a simple construction which can be easily repaired and one which will not be expensive to manufacture.

A further object is topprovide a ytool which can be adjusted to receive a plain micrometer or a thread micrometer.

With these and other objects in view, my invention consists in the construction, combina-tion and arrangement of parts as will be hereinafter fully described, illustrated in the accompanying` drawings and pointed out Vin the claim hereunto appended.y

Referring to the drawings, Figure 1 illustrates a front plan view of the preferred embodiment of my invention.

Fig. 2 is a sectional view on the line 2-2 of Fig. l.

Fig. 3 is a sectional view on the line 3 3 of Fig l.

4 indicates a steel bar ground to a' convenient and accurate size. 5 is a dovetail slot running longitudinally along the front side. from one end. Holes 6 are drilled from the back of the member 4 so as to come in the center of the inner side of the dovetail slot 5. These holes 6 are approximately one inch apart and in Fig. 1, I show a tool of a twelve-inch capacity. Therefore, it has twelve holes 6.

At one end of the bar 4 I provide a stationary jaw 7, which is secured to the bar by screws. The free end of this jaw '7 is provided with a hole. An anvil 8 is adapted to be inserted partly through this hole and a thumb-nut 9 rigidly holds the anvil in proper position. This anvil may have any desired outer end such as is commonly used in mechanical practice.

10 is a sliding jaw having a covering plate 11, adapted to hold the jaw in proper sliding position. This sliding jaw 10 extends out at :right angles to the bar'4 and on the same side as the stationary jaw 7. The slidable jawA 10 basan opening at its outer free endiin alinement with .the opening in the end of the stationary jaw 7 This opening is to receive a standard micrometer head which .is commonly used to measure very small parts of an inch. By a tightening nut fitted into the threaded opening 11a, the

Vmicrometer head will be rigidly held in the jaw 10.

Adjacent the dovetail slot 5, the front face of the bar 4 is marked off into inch spaces and marked accordingly. The first marking is so arranged that the distance between the points of the anvil 8 and the micrometer head touch whenthe point of the micrometer head is extended out one inch.

Opposite each hole 6 is a number of stops 12. These stops 12 are slidably positioned in the dov'etail slot 5 and are heldin position by screw-threaded plugs 15 through the opening 6.

The plate 11 is provided with a bushing 16 which extends through central orifice 17. The bushing hasV a tapered central orifice adapted to reeeivethe setting plug 18. The tool is made so that this plug tits into the dovetail slot and is adapted to come in contact with the stops 12. Above, I have indicated how to find where the one inch mark- 4ing should be on the face of the bar 4.

l/Vhen this is in the position as referred to the setting plug 1S will be tight against the side of the plug` 12 as indicated by 18a. In this position the micrometer head is given an inch space in which to operate. Should the article which you desire to measure be over 4 inches, withdraw the setting plug 18 and slide the slidable jaw 10 to the fourinch space. Put in the setting plug. Slide along-the jaw 10 until the plug strikes the next stop 12. The graduation on the beam next to the slidable jaw will be four inches. In this position you desire the jaw to be held stationary and for this purpose I provide a binding screw 19, which is threadedly engaged in the upper end of the slidable jaw 1() and which, when threaded down, will bind on the upper sideof the bar 4 so as to hold the 10 in xed position. The micrometer head can then be operated so as to get the accurate measurements of the four-inch or over article as above referred to.

I do not wish to limit myself in any way to a twelve-inch caliper, a particular shaped Calipers consisting of a bar witha dovetail slot with graduations along said slot and holes in the rear wall of said slot, jaws, one secured to and the other slidable on said bar, anlanvil on the fixed jaw, a micrometer head carried by the slidable jaw, stops in Y said slot, screws threaded through said holes for adjustably securing said stops in Vsaid slot, a carrier for the slidable aw, a bushing on said carrier, a setting plug carried by the bushing and entering said slot and adapted to abut said stops, and means carried by the Vslidable jaw and engageable with said bar to` hold the slidable jaw in position.

ln testimony whereof I hereunto alix my signature in the presence of two witnesses.

JOSEPH WENCELASS LOVELL.

l di lVitnesses Y GEORGE ELDER; JAMES ELDER.V 

